Turns out Shion doesn’t have the power to draw allies to her; Hinamizawa just happens to be super tight-knit, and an attack on one of them is treated like an attack on all. Maybe the village should be called NATOmizawa, eh? Anywho, Shion changes on a dime from some kind of gangstress to a sweet lass when Ooishi and the cops arrive to take the punks away.
Keiichi is treated to a meal with Shion, who tells him the story about the dam project thwarted by that same village solidarity, weathering violent riots and legal wrangling. Later Keiichi gets a call to come be the guinea pig for the new dessert menu, and he defends Shion’s honor against two boorish otaku.
His ass is kicked, but for Shion the fact he defended her is what matters, and she begins to cling to him like a lover. They go out shopping together and end up at the shop where Mion works part-time, marking the first time we’ve seen the twins together and confirming there are in fact two of them, and that Shion was probably impersonating Mion at times.
Shion is the younger of the two yet more mature and refined compared to Mion’s rougher edges. Shion is also pretty blatant about basically stealing Keiichi out from under Mion’s nose, and whether it’s Shion getting Keiichi to buy a doll for her or talking with him after festival preparations the next day, Mion doesn’t seem too thrilled about her flirty twin sister-interloper.
Things get downright sinister when Tanako Miyo and Tomitake Jirou appear for the first time in this arc. Turns out Miyo’s a bit of a sicko, going on about the death and dismemberment kicking off an annual “curse” of one person in the village being murdered and another “sacrificed” (as opposed to “demoned away” in the last arc). Mion tries to get Keiichi away from the “lame story” but is unsuccessful.
Keiichi’s morbid curiosity and susceptibility to peer pressure rear their ugly heads again the night of the Watanagashi festival, when instead of watching Rika he is pulled away by Shion to the location of the shrine storehouse, where they catch Tanako and Tomitake breaking in. Shion and Keiichi decide to be partners in crime and have a look inside, as it supposedly contains “old ritual tools” that might fascinate Keiichi.
When he agrees, Tanako tells him “you’ve made your choice”, which is really what you want to hear when about to break and enter a dark creepy storehouse. I guess it was Shion’s goal all along to lure Keiichi into this very situation, but why she’s doing so, and what things await him remain tantalizing mysteries.